man 2: i earned my medicare and social security. and i deserve some answers. anncr: where do the candidates stand on issues that... affect seniors today and in the future? find out with the aarp voters' guide at earnedasay.org throughout our lives. one a day women's 50+ is a complete multivitamin designed for women's health concerns as we age. it has more of 7 antioxidants to support cell health. one a day 50+. >>> and finally tonight, could a priceless painting actually be a copy? mona lisa, da vinci's mysterious masterpiece is now being challenged by a younger rival. her owners, of course, have millions of reasons to believe their painting is the original. so, abc's jeffrey kofman takes a close look so you can decide for yourself. >> reporter: could it be? the most famous painting in the world now has a twin? >> mona lisa. leonardo's earlier version. >> reporter: that's what the owners of the so-called isleworth mona lisa told the world today. hidden in a swiss bank vault for almost half a century, it emerged accompanied by a stack of "evidence" meant to pro